Is there another resistor of the same stated value to measure? Unless there is a K or M or some other marking, you would expect the resistor in question to be 510 ohms, just like the 180 ohm resistor. There is not a standard for printed values but markings usually make it clear.

You need either a comparable resistor or manufacturer spec sheet to be sure.

Ignoring measurement technique- a number may match or be totally unrelated to resistance. You can't count on it. Even a match can have quite a bit of tolerance. *If the package is not charred or damaged and is connected properly, there is a 99%+ chance that it will work properly, regardless of the measurement. *A rule of thumb from way back in my circuit component troubleshooting & repair days.

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